You'll be forgiven for thinking Tizen is dead and resting in the large cemetary of failed mobile operating systems. Not only has the Tizen SDK 2.0 alpha been released, with highlights that include broader HTML5 support, USB accessory function support, web UI framework, Tizen web API's, improved IDE and development tools, but also an actual (insert rumour) phone, named the GT-i9300_TIZEN. Yup, an SIII running Tizen.

Tizen and FF are part of the same HTML5 ecosystem: Tizen's success is good for FF and vice versa. Even Blackberry10 browser's excellent HTML5 score is an important milestone: http://html5test.com/results/mobile.html

The Tizen roadmap: Tizen 2.0 in December, devices in Q1 2013
Touchwiz is just a zero cost UI on a Samsung prototype: each participant in the TA will have his own UI of course: http://www.tizenassociation.org/en/